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Chapter 06
Energy and Metabolism
BIOLOGY
Thirteenth Edition
Raven, Johnson, Mason, Losos,
Duncan
© 2023 McGraw Hill, LLC. All rights reserved. Authorized only for instructor use in the classroom.
No reproduction or further distribution permitted without the prior written consent of McGraw Hill, LLC.
, Flow of Energy
Thermodynamics
• Branch of chemistry concerned with energy changes.
Cells are governed by the laws of physics and chemistry
© McGraw Hill, LLC 2
, Energy
Capacity to do work
Two states:
1. Kinetic – energy of motion
2. Potential – stored energy
Many forms – mechanical, heat, sound, electric current, light,
or radioactivity
© McGraw Hill, LLC 3
, Measuring Energy
Heat is most convenient way of measuring energy
• 1 calorie = heat required to raise 1 gram of water 1° C.
• Calorie on food labels (with a capital C) is actually a
kilocalorie (1000 calories).
© McGraw Hill, LLC 4
Chapter 06
Energy and Metabolism
BIOLOGY
Thirteenth Edition
Raven, Johnson, Mason, Losos,
Duncan
© 2023 McGraw Hill, LLC. All rights reserved. Authorized only for instructor use in the classroom.
No reproduction or further distribution permitted without the prior written consent of McGraw Hill, LLC.
, Flow of Energy
Thermodynamics
• Branch of chemistry concerned with energy changes.
Cells are governed by the laws of physics and chemistry
© McGraw Hill, LLC 2
, Energy
Capacity to do work
Two states:
1. Kinetic – energy of motion
2. Potential – stored energy
Many forms – mechanical, heat, sound, electric current, light,
or radioactivity
© McGraw Hill, LLC 3
, Measuring Energy
Heat is most convenient way of measuring energy
• 1 calorie = heat required to raise 1 gram of water 1° C.
• Calorie on food labels (with a capital C) is actually a
kilocalorie (1000 calories).
© McGraw Hill, LLC 4
